Vulcanization retarders of trihalo-sulphenyl-sulphonamides

ABSTRACT

COMPOUNDS OF THE FORMULA   R-SO2-N(-R1)-S-C(-CL)2-X   IN WHICH   R REPRESENTS AN ALKYL RADICAL OPTIONALLY SUBSTITUTED BY CHLORINE, A CYCLOALKYL RADICAL, AN ARYL RADICAL OPTIONALLY SUBSTITUTED BY AT LEAST ONE ALKYL GROUP AND/OR CHLORINE ATOM, AN ARALKYL RADICAL OR A DIALKYLAMINO GROUP, R1 REPRESENTS AN ARYL RADICAL OPTIONALLY SUBSTITUTED BY AT LEAST ONE ALKYL GROUP AND/OR CHLORINE ATOM, AND X REPRESENTS CHLORINE OR FLORINE ARE USED AS VULCANIZATION RETARDERS INNATURAL AND/OR SYNTHETIC RUBBER MIXTURES. ONE OF THESE VULCANIZATION RETARDERS OF THE AFOREMENTIONED GENERAL FORMULA IS NPHENYL - N -(TRICHLOROMETHYLSULPHENYL) - METHYLSULPHONAMIDE.

United States Patent 01 3,703,500 Patented Nov. 21, 1972 3,703,500 VULCANIZATION RETARDERS F TRIHALO- SULPHENYL-SULPHONAMIDES Roland Nast, Dormagen, Engelbert Kiihle, Bergisch Gladbach, and Manfred Abele, Porz, Germany, assignors to Farbenfabriken Bayer Aktiengessellschaft, Leverkusen, Germany No Drawing. Filed Oct. 20, 1970, Ser. No. 82,493 Claims priority, application Germany, Nov. 15, 1969,

P 19 57 484.6 Int. Cl. C08f 27/06; C08c 11/54 US. Cl. 260--79.5 B 11 Claims ABSTRACT OF THE DISCLOSURE Compounds of the formula 01 R-s02N-s-+-o1 in which R represents an alkyl radical optionally substituted by chlorine, a cycloalkyl radical, an aryl radical optionally substituted by at least one alkyl group and/or chlorine atom, an aralkyl radical or a dialkylamino P, R represents an aryl radical optionally substituted by at least one alkyl group and/or chlorine atom, and X represents chlorine or fluorine are used as vulcanization retarders in natural and/or synthetic rubber mixtures. One of these vulcanization retarders of the aforementioned general formula is N- phenyl N (trichloromethylsulphenyl) methylsulphonamide.

The present invention relates to the use of substituted sulphonamides as vulcanization retarders for the production and application of mixtures based on natural or synthetic rubber.

In the production and application of rubber mixtures which contain vulcanization agents such as sulphur and accelerators, a certain amount of unwanted premature vulcanization, known as scorching, may occur before the actual vulcanization (see Bayer-Mitteilungen fiir die Gummi-Industrie No. 42 of I an. 5, 1968, pages 3-7, especially page 3, lefthand column). This scorching may occur, for example, in the mixer or during any of the subsequent application processes such as spraying or calendering.

It is already known that the risk of scorching can be reduced by the addition of N-nitroso-amines such as N- nitroso-diphenylamine to rubber mixtures (see Technical information R 22 Rubber Chemicals" of Imperial Chemical Industries, Manchester, England, pages 1-11, especially page 1; Rubber Chemistry and Technology, volume 30 (1957), pages 1291-1346, especially page 1302, lines 3 and 4; and Rubber Journal, March 1967, page 11, righthand column, paragraph 2, especially line 1-8 in the righthand column). 4

Under certain conditions, however, the use of these retarders results in the formation of porous vulcanizates due to the nitroso group being split off (see Technical Information R 22 Rubber Chemicals of Imperial Chemical Industries, Manchester, England, pages l-l l, especially page 2, second paragraph). Furthermore, these compounds not only have an effect on the scorching but also substantially increase the time required to complete the vulcanization process (see Bayer Mitteilungen fiir die Gummi-Industrie, No. 42 of Ian. 5, 1068, pages 3-7, especially page 3, righthand column, lines 39-45 and page 3, righthand column, last paragraph, especially lines 47, 48, 55 and 56).

Moreover, a relatively large amount of the N-nitroso amine is required to achieve a given retarding effect.

It has now been found that substituted trihalomethylsulphenyl-sulphonamides of the general formula:

in which R represents an alkyl radical optionally substituted by chlorine, a cycloalkyl radical, an aryl radical optionally substituted by at least one alkyl group and/or chlorine atom, an aralkyl radical or a dialkylamino group,

R represents an aryl radical optionally substituted by at least one alkyl group and/or chlorine atom, and X represents chlorine or fluorine are suitable for use as vulcanization retarders in the conventional methods of producing and applying mixtures containing natural or synthetic rubber.

The trihalomethyl-sulphenyl-sulphonamides according to the invention surprisingly show a considerably more powerful effect as vulcanization retarders than the N- nitrosoamines known in the art. In addition, they do not give rise to porous vulcanizates and if used in suitable quantities they have less influence on the time required to complete vulcanization than N-nitroso-amines.

The following are examples of radicals R in the Formula I: Unbranched or branched alkyl groups with from 1 to 6 carbon atoms and optionally substituted by chlorine, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, tertiary-butyl, n-pentyl, n-hexyl, chloromethyl, chloroethyl, 1-ch10ron-propyl, Z-chJoro-n-propyl, l-chloro-isopropyl or 2-chloro-isopropyl; cycloalkyl groups such as cyclopentyl, cyclohexyl or methyl cyclohexyl; aralkyl groups such as benzyl, phenylethyl, phenylpropyl or phenylisopropyl.

The following are examples of aryl radicals R optionally substituted by alkyl groups: Phenyl, a-naphthyl, [El-naphthyl, methylphenyl, ethylphenyl, n-propylphenyl, isopropylphenyl, n-butylphenyl or tertiary-butylphenyl, the alkyl groups in all these cases being either in the ortho,

the meta or para-position of the' phenyl radical; furthermore: 2,3-dimethylphenyl, 2,4-dimethylphenyl,

2,5-dimethylphenyl, 2,6-dimethylphenyl,

3,5 -dimethylphenyl, 3,4-dimethylphenyl, 2,3-diethylphenyl, 2,4-diethylphenyl, 2,5-diethylphenyl, 2,6-diethylphenyl, 3,4-diethylphenyl, 3,5-diethylphenyl, 2-methyl-3-ethylpl1enyl, 2-methyl-4-ethylphenyl, 2-methyl-5 -ethy1phenyl, 2-methyl-6-ethy1phenyl, 3-methyl-2-ethylphenyl, 3-methyl-4'ethylphenyl, 3-methyl-5-ethylphenyl, 4-methyl-2-ethylphenyl, 4-methyl-3-ethylphenyl, 5-methyl-2-ethylphenyl, 2,3,4-trimethylphenyl, 2,3,5-trimethylphenyl, 2,3,6-trimethylphenyl, 2,3,5-trimethylphenyl, 2,4,6-trimethylphenyl, 3,4,5-trimethylphenyl, 2,3-dimethyl-4-ethylphenyl, 2,3-dimethyl-5-ethylphenyl, 2,3-dimethyl-6-ethylphenyl, 2,4-dimethyl-3-ethylphenyl, 2,4-dimethyl-S-ethylphenyl, 2,4-dimethyl-6-ethylphenyl, 2,S-dimethyl-3-ethylphenyl, 2,5 -dimethy1-4-ethylphenyl, 2,5-dimethyl-6-ethylphenyl, 2,6-dimethyl-3 -ethylphenyl, 2,6-dimethyl-4-ethylphenyl, 3,4-dimethyI-2-ethylphenyl, 3,4-dimethyl-5-ethylphenyl, 3,4-dimethyl-6-ethylphenyl, 3,5 -dimethyl-4-ethylphenyl, 3,S-dimethyl-6-ethylphenyl, 4-methyl-2,3-diethylphenyl, 5-methyl-2,3-diethylphenyl, 6methyl-2,S-diethylphenyl, 3-methyl-2,4-diethylphenyl, 5methyl-2,4-diethylphenyl, 6-methyl-2,4-diethylphenyl, 3-methyl-2,S-diethylphenyl, 4-methyl-2,5-diethylphenyl, 6-methyl-2,S-diethylphenyl, 3-methyl-2,6-diethylphenyl, 4-methyl-2,6-diethylphenyl, 2-methyl-3,4-diethylphenyl, 5-methyl-3,4-diethylphenyl, 6-methyl-3,4-diethylphenyl, 4-methyl-3,S-diethylphenyl, 6-methyl-3,S-diethylphenyl, 2,3,4-triethylphenyl, 2,3,5-triethylphenyl, 2,3,6-triethylphenyl, 2,4,5-triethylphenyl, 2,4,6-triethylphenyl, or 3,4,5-triethylphenyl.

The following are mentioned as examples of aryl radicals R optionally substituted by at least one chlorine atom:

4-chlorophenyl,

2-chlorophenyl, 2,4-dichlorophenyl, 3,4-dichlorophenyl, 2,4,6-trichlorophenyl, 3-chlorophenyl, 2-methyl-4-chlorophenyl, 4-methyl-2-ch1orophenyl,

4- 4-methyl-3-chlorophenyl, 2-ethyl-4-chlorophenyl, 4-ethyl-2-chlorophenyl, 2-rnethyl-4,6-dichlorophenyl, 2,4-dimethyl-6-chlorophenyl, 4-methyl-2,6-dichlorophenyl, 2,6-dimethyl-4-chlorophenyl, 2,5-dimethyl-4-chlorophenyl, 2,S-dimethyl-3-chlorophenyl, 2,4-diethyl-6-chloropl1enyl, 2,6-diethyl-4-chlorophenyl, 2,S-diethyl-4-chlorophenyl, 2,5-diethyl-3-chlorophenyl, 2-methyl-4-ethyl-6-chlorophenyl, 4-rnethyl-2-ethyl-6-chl0r0phenyl, 2-methy1-5 -ethy1-4-chlorophenyl.

The following are suitable as dialkylamino groups R:

dimethylamino, dietliylamino, di-n-propylamino, diisopropyl-amino, di-n-butylamino, di-tertiary-butylamino, methylethylamino, methyl-n-propylamino, methylisopropylamino, methyl-n-butylamino, methyl-tertiary-butylamino, ethyl-n-propylamino, ethyl-isopropylamino, ethyl-n-butylamino, ethyl-tertiary-butylarnino, n-propyl-n-butylamino, n-propyl-tertiary-butylamino, isopropyl-n-butylamino,

and the isopropyl-tertiary-butylamino group.

Suitable aryl radicals R optionally substituted by alkyl groups and/or chlorine atoms are the groups already mentioned for the radical R.

The following are mentioned as individual examples of compounds which may be used for the invention:

N-phenyl-N-(trichloromethylsulphenyl)-benzenesulphonamide,

N-o-tolyl-N-(trichloromethylsulphenyl)-benzenesulphonamide,

N-p-tolyl-N-(trichloromethylsulphenyl)-benzenesulphonamide,

N-m-tolyl-N-(trichlorornethylsulphenyl)-benzene sulphonamide,

N-phenyl-N-(trichloromethylsulphenyl)-methylsulphonamide,

N-phenyl-N-(trichloromethylsulphenyl)-chloromethylsulphonamide,

N-phenyl-N-(trichloromethylsulphenyl)-N,N'-dimethylsulphamide,

N-phenyl-N- (trichloromethylsulphenyl) -cyclohexylsulphonamide,

N-phenyl-N-(trichloromethylsulphenyl)-p-toluenesulphonamide,

N-phenyl-N-(fluorodichloromethylsulphenyl)-N,N'-

dimethylsulphamide,

N-phenyl-N- fluorodichloromethylsulphenyl )-benzenesulphonamide,

N-phenyl-N- (fiuorodichloromethylsulphenyl)-methylsulphonamide,

N-phefiiyl-N- (trichloromethylsulphenyl -ethylsulphonam e N-phenyl-N-(trichloromethylsulphenyl)-n-propylsulphonamide,

N-phenyl-N-(trichloromethylsulphenyl)-isopropylsulphonamide,

N-phenyl-N-(fiuorodichloromethylsulphenyl)-ethylsulphonamide,

N-phenyl-Nl (fluorodichloromethylsulphenyl -n-propylsulphonamide.

N-phenyl-N-(fluorodichloromethylsulphenyl)-isopropyl-' sulphonamide,

N-phenyl-N- (trichloromethylsulphenyl) -n-butylsulphonamide,

N-phenyl-N- trichloromethylsulphenyl) -tertiary-butylsulphonamide,

N-phenyl-N- (fluorodichloromethylsulphenyl n-butylsulphonamide,

N-phenyl-N- (fluorodichloromethylphenyl) -tertiarybutylsulphonamide,

N-phenyl-N- (trichloromethylsulphenyl -N,N'-diethylsulphamide,

N-phenyl-N- (trichloromethylsulphenyl -N,N'-di-npropylsulphamide,

N-phenyl-N- trichlorornethylsulphenyl) -N,N'-diisopropylsulphamide,

N-phenyl-N (fluorodichloromethylsulphenyl) -N',N-

diethylsulphamide,

N-phenyl-N- (fluorodichloromethylsulphenyl) -N',N'-

di-n-propylsulphamide,

N-phenyl-N-N- (fluorodichloromethylsulphenyl -N,N'-

diisopropylsulphamide,

N-o-tolyl-N- (fiuorodichloromethylsulphenyl benzenesulphonamide,

N-p-tolyl-N- (fluorodichloromethylsulphenyl) -benzenesulphonamide,

N-o-tolyl-N- fluorodichloromethylsulphenyl) -methylsulphonamide,

N-p-tolyl-N- fluoro dichloromethylsulphenyl) -methylsulphonamide,

N-o-tolyl-N- (trichloromethylsulphenyl) -methy1sulphonamide,

N-p-tolyl-N-(trichloromethylsulphenyl)-methy1- sulphonamide,

N-phenyl-N- (fluorodichloromethylsulphenyl -o-toluenesulphonamide,

N-phenyl-N- (fluorodichloromethylsulphenyl) -cyclohexylsulphonamide,

N-o-tolyl-N- (fluorodichloromethylsulphenyl) -cyclohexylsulphonamide,

N-p-tolyl-N- (fluorodichloromethylsulphenyl -cyclohexylsulphonamide,

N-phenyl-N- (fluorodichloromethylsulphenyl -methylcyclohexyl sulphonamide,

N-o-tolyl-N- (fluorodichloromethylsulphenyl -methylcyclohexyl sulphonamide,

N-p-tolyl-N- fluorodichloromethylsulphenyl -methylcyclohexyl sulphonamide,

N-o-tolyl-N- (fluorodichloromethylsulphenyl) -methylcyclohexyl sulphonamide,

N-p-tolyl-N- fiuorodichloromethylsulphenyl -methylcyclohexyl sulphonamide,

N-phenyl-N- (trichloromethylsulphenyl) -methylcyclohexylsulphonamide,

N-phenyl-N' (trichloromethylsulphenyl) -chloro ethylsulphonamide,

N-phenyl-N- (fluorodichloromethylsulphenyl -chloroethylsulphonamide,

N-o-tolyl-N- (fluorodichloromethylsulphenyl -chloroethylsulphamide,

N-p-tolyl-N- fluorodichloromethylsulphe nyl -chloroethylsulphamide,

No-tolyl-N- (trichloromethylsulphenyl -chloroethylsulphonamide,

N-p-tolyl-N- trichloromethylmethylsulphenyl -chloro ethyl sulphonamide,

N-o-tolyl-N- (trichloromethylsulphenyl) -N',N-dimethylsulphonamide,

N-p-tolyl-N- (trichloromethylsulphenyl -N',N'-dimethylsulphonamide,

N-o-tolyl-N- (trichloromethylsulphenyl) -N',N'-diethylsulphamide N-p-to1yl-N-( trichlorornethylsulphenyl) -N,N-diethylsulphamide,

N-o-tolyl-N- (fiuorodichloromethylsulphenyl) N',N'-

dimethylphamide N-p-tolyl-N- (fluoro dichlormethylsulphenyl -N,N-

dimethylsulphamide,

N-o-tolyl-N- (fluorodichloromethylsulphenyl) -N',N-

diethylsulphamide,

N-p-tolyl-N- (fiuorodichloromethylsulphenyl -N,N-

diethylsulphamide,

N-o-tolyl-N- (fiuorodichloromethylsulphenyl) ethylsulphonamide,

N-p-tolyl-N- (fluorodichloromethylsulphenyl) ethylsulphonamide,

N-otoly1N- (trichloromethylsulphenyl) ethylsulphonamide,

N-p-tolyl-N- trichloromethylsulphenyl) ethylsulphonamide,

N-phenyl-N- (trichlorornethylsulphenyl -o-toluenesulphonamide,

N-o-tolyl-N- (fiuorodichloromethylsulphenyl -otoluenesulphonamide,

N-p-tolyl-N- (fluorodichloromethylsulphenyl) -ptoluenesulphonarnide, and

N-phenyl-N- trichloromethylsulphenyl) -methylcyclohexylsulphonamide.

Suitable rubbers for the production and application of mixtures based on natural or synthetic rubber are, for examples, natural rubber or synthetic, rubber-like polymers which are obtained, for example, from conjugated diolefines such as butadiene, dimethylbutadiene, isoprene and its homologues, or coplymers of such conjugated diole fines with polymerisable vinyl compounds such a styrene, u-methylstyrene, acrylonitrile, methacrylonitrile, acrylates and methacrylates.

The retarders to be used according to the invention may be mixed with the rubber in the conventional manner, for example on mixing rollers or in an internal mixer. They are preferably added before or together with the other constituents although they may be added last. The quantity of the retarders according to the invention should preferably be 0.05 to 5.0% by weight and in particular 0.1 to 1.5% by weight of the rubber.

The rubber mixtures which are to be treated contain of course, the usual additives required for vulcanization, such as vulcanizing agents and accelerators. The vulcanizing agent, e.g. rubber, may be used in the usual quantity for vulcanization, which is generally from 0.2 to 5.0% by weight of the rubber. The following are mentioned as examples of accelerators:

Thiazoles such as Z-mercaptobenzothiazole or dibenzothiazyl disulphide, sulphenamides such as benzothiazyl-Z- cyclohexyl sulphenamide, benzothiazyl-2-tertiary-butyl sulphenamide or benzothiazysulphenomorpholide, guanidines such as diphenylguanidine or di-o-tolyguanidine, dithiocarbamates such as diethyldithiocarbamic acid zinc, and thiurams such as tetramethylthiuramic disulphide or tetramethylthiuramic monosulphide. Mixtures of accelerators may also be used. The accelerators are generally used in quantities of from 0.05 to 5% by weight of the rubber.

The rubber mixture may also contain other conventional auxiliary agents, e.g. active or inactive fillers such as chalk or carbon black, antioxidants, antiozonants, waxes, pigments, zinc oxide, fatty acids such as stearic acid, or oils which assist in the application of the products.

Vulcanization of the rubber may be carried out by heating to the usual temperatures, preferably to a temperature of from C. to C., but higher or lower temperatures may be employed.

The compounds claimed according to the invention may be prepared by reacting perchloromethylmercaptan or fluorodichloromethanesulphenylchloride with N-arylsul phonamides or with N-aryl-N,N'-dialkylsulphamides.

The examples given below serve to illustrate the invention. The figures given in the tables are parts by Weight based on 100.0 parts by weights of the rubber.

The test methods are defined as follows (see also Kautschuk und Gurnmi; Kunststoffe 20, No. 3/ 1967, pages 126-134, especially pages 127 and 133).

Scorch time: In analogy to the Mooney Scorch time (see DIN 52524), time determined from the modulus aire time curve until the modulus at 300% elongation increases by 20 points above the minimum (stepwise vulcanization at 110 C.)

M 300: Modulus (kg. wt./cm. at 300% elongation according to DIN 53,504, sheet 2.

F: Tensile strength (kg. wt./cm. according to DIN 53,504, sheet 1, standard ring RI D: Elongation at beark (percent) according to DIN 53,504, sheet 1, standard ring R I H: Hardness (Shore A), DIN 53,505, range A, 4 mm.

flaps:

Complete vulcanization time: Time taken to reach 90% of the maximum modulus value (at 300% elongation) at 140 C.

EXAMPLE 1 49 g. (0.2 mol) of p-toluenesulphonic acid anilide are dissolved in 500 m1. of toluene. 25 g. of triethylarnine are added, and a solution of 37 g. (0.2 mol) of trichloromethylsulphenylchloride in 50 ml. of toluene is added droptained.

o r-n-Q-sm-rv-s-o on Analysis.Calcd. for C H Cl NO S (396.5) (percent): C, 42.4; H, 3.0; N, 3.5. Found (percent): C, 43.1; H, 3.3; N, 3.9.

If the amides mentioned under A in the following Table I are used instead of p-toluenesulphonic acid anilide and the sulphene chlorides mentioned under B are used instead of trichloromethylsulphenyl chloride, the reaction products C are obtained.

The following mixtures were prepared on mixing rolls:

Mixture Number Natural rubber, smoked sheets Zinc oxide- Stearic acid Aromatic mineral oil plasticizer High abrasion resistant furnace black Naphthenic mineral oil plasticiser Sulphur N-eyclohexyl-2-benzothiazylsulphenamide N-nitroso-diphenylamine (for comparison) N-phenyl-N-(triohloromethylsulphenyl) -methylsulphonamid N-phenyl-N-(trichloromethylsulphenyl) -chloromethylsulphonamide N-phenyl-N-(trichloromethylsulphenyl)-benzcnesu1phonamide. Notolyl-N-(trichloromethylsulphenyl)-benzenesulphonamide N-phenyl-N-(trichloromethylsulphenyl) -p-toluenesulphonamide- N-phenyl-N-(trichloromethylsulphenyl) -N',N-dimethylsulpham Z-phenyl-N-(fluorodichloromethylsulphenyl)-N,N'-dimethylsulphaml The mixtures obtained were press vulcanized to produce test samples 4 mm. in thickness, heating being carried out stepwise at 110 C. and 140 C. The results shown in Table II were obtained.

TABLE 11 Complete Mechanical properties corresponding vulcanito the complete vulcanization time Scorch zation time at time at M 300, Mixture 110 0., 140 0., F kg. D, kg. wt./ H, No. Scorch retarders min. min. wtjcm. percent cm. shore A 1 None. 62 22.0 244 540 114 62 2 N-nitrosodiphenylamine (ior comparison) 85 28. 0 228 550 105 60 3 N-phenyl-N-(trichloromethylsulphenyl)-methyl sulphonamide 88 26.3 237 544 110 61 4 N-phenyl-N-(trichloromethylsulphenyl)-chloromethylsulphonamide 93 26.5 201 470 111 62 5 N-phenyl-N-(trichloromethylsulphenyl)-benzenesulphonamlde 83 26.0 240 542 112 62 6 N-o-t0lyl-N-(trichloromethylsullphenyl)-benzene sulphonamide.- 79 25.3 240 550 112 61 7. N-phenyl-N-(trichloromethylsu phenyl)-p-toluenesulphonamide- B2 25. 3 239 552 108 61 8 N-pheny1N-(trichloromethylsulphenyl)-N,N-dimethylsulphamide 79 25. 2 235 545 110 61 9 N-phenyl-N-(fiuorodichloromethylsulphenyl)-N,N'-dimethylsulphamide 84.5 25.5 242 540 113 62 It will be seen from these figures that the new retarders 4. A process as claimed in cla1m 1 wherein the vulcaniincorporated in an amount of 0.2% by weight based on 40 zation retarder is N-phenyl-N-(trichloromethylsulphenyl)- 100.0 parts by weight of rubber have the same retarding methylsulphonamide.

effect as N nitroso diphenylamine incorporated in an 5. A process as claimed in claim 1, wherein the vulcaniamount of 0.6% by weight. It follows, therefore, that the zation retarder is N-phenyl-N-(trichloromethylsulphenyl)- new retarders have three times the activity of N-nitrosochloromethylsulphonamide. diphenylamine, and in some cases even higher activities 6. A process as claimed in claim 1, wherein the vulcaniare found (see Table II). zation retarder is N-phenyl-N-(trichloromethylsulphenyl)- The complete vulcanization time of every one of the benzene sulphonamide. mixtures prepared according to the invention is less than 7. A process as claimed in claim 1, wherein vulcanizathat of the mixture prepared with N-nitroso-diphenyltion is carried out at a temperature of from 120 C. to amine. The very advantageous influence of the compounds 170 C. used according to the invention on the vulcanization char- 8. A mixture containing natural rubber or a synthetic acteristics is therefore clear. rubber-like polymer of a conjugated diolefin together with What we claim is: a compound of the formula of claim 1. 1. In the process of vulcanizing natural rubber or a syn- 9. A mixture containing natural rubber or a synthetic thetic rubber-like polymer of a conjugated diolefin in the rubber-like polymer of a conjugated diolefin together with presence of a vulcanization retarder, the improvement N-phenyl-N-(trichloromethylsulphenyl) methylsulphoncomprising employing, as the vulcanizing retarder, a comamide. pound of the formula 10. A mixture containing natural rubber or a synthetic C1 rubber-like polymer of a conjugated diolefin together with I N-phenyl N (trichloromethylsulphenyl)-chloromethyl- R SO 1F S (|J 'C1 sulphonamide.

R1 X 11. A mixture containing natural rubber or a synthetic wherein R is alkyl, chloro, cycloalkyl, aryl, alkaryl, chlororubber-like p lf of a conjugated diolefin togfithel Wlth aryl, aralkyl or dialkylamino; R is aryl, alkaryl, chloro- -g y y p y p aryl and X is chlorine or fluorine. amide.

2. The process as claimed in claim 1 wherein a vulcanization retarder is incorporated into the mixture in an No references cltedamount of from 0.05 to 5.0% by weight based on said natural rubber or synthetic rubber-like polymer of a con- JAMES SEIDLECK Pnmary Examiner iugated diolefifl- C. A. HENDERSON, JR., Assistant Examiner 3. The process as claimed in claim 1 wherem the vulcanization retarder is incorporated into the mixture in an US. Cl. X.-R.

amount of 0.1 to 1.5% by weight based on said natural rubber or synthetic rubber-like polymer of a conjugated 260-453 R, 556 AR, 556A, 780

UNITED STATES PATENT OFFICE CERTIFICATE OF CRRECTION Patent No. $703500 Dated m r 1, 1972 Inventor; Roland Nasc, Engelbert Kfinle and Manfred Abele It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

i Col. 1, line 6, change "Farbenfabriken Bayer Aktiengesellschaft" to Bayer Aktiengesellschaft Col. 9, line 63, change "chloro" to chloroalkyl Signed al ld sealed this 13th day of November 1973.

(SEAL) Attest:

RENE D. TEGTMEYER 'Acting'Commissioner' of Patents EDWARD IVLFLE'ICI-IERQJR. Attesting Officer EORM o-1osnuo-es) 

